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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financial instruments
Preferred stock of subsidiary	$ 30.4	$ 30.4
Carrying amount
Financial instruments
Preferred stock of subsidiary	30.4	30.4
Long-term debt, including current portion	13,549.7	13,563.4
Finance lease obligations	128.0	129.7
Fair value
Financial instruments
Preferred stock of subsidiary	26.6	30.3
Long-term debt, including current portion	$ 13,519.8	$ 14,819.4

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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